Malicious PDF — malware analysis report

Static analysis result for SHA-256 8425b88667f17526…

MALICIOUS

PDF

49.1 KB Created: 2020-10-30 04:05:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f90fb87bce5bf72de3de565a41c78eba SHA-1: 37a1d680025540d2b2f2e8bb53a2170c60c5c5ee SHA-256: 8425b88667f17526d2be75b551617000af3e903e7b02f37c9d5db7e331fb56a9
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links pointing to a known malicious redirector, ggtraff.ru, which is also referenced by a critical heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to lure the user to a malicious site. The presence of numerous external PDF links further indicates a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?keyword=do+you+kick+the+ball+in+volleyball In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f894d29cf7c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5f8c3a449bc46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f872c6ea3811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_5f8cf1e2412f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f8ffaf8005a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5f925a7b3eb98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tosevud/keluxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8177/5287/files/aadhar_card_update_by_post_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/a_programmer_s_introduction_to_mathematics.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/79528679570.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/hyundai_accent_2008_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/railway_station_codes_free_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75C0 3304 bytes
SHA-256: 7c54c13321a22b13e8c8cf75e560e9151677e82cfd7fb4553fa360d909f90a16
font_01_sfnt_off000081a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A5 4980 bytes
SHA-256: 036dec471fa04d344bd74c0ea19f30781b157735d59780a8a55b1a5bae4c166e
font_02_sfnt_off000092ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92AC 10620 bytes
SHA-256: fb108e4336b9b0aa9b05f3f3ecd864a4d5c87151fd75338d2a5be3c8709af6bb